This letter was reported earlier today, before Carter's name became public. The letter also says Manurewa MP George Hawkins is being challenged by a union member for nomination, understood to be a EPMU member, and is threatening a by-election.

"There are no more chances. His future in the Labour Party is at an end," Goff said.

Goff said he recognised Mr Carter's handwriting on the envelope of the anonymous letter addressed, as I recall, to Vernon Small at the Press Gallery.( update: it was sent to other media outlets also). Carter may be expelled from the party as early as next weekend and nominations will be reopened for the Te Atatu electorate - of which Carter's partner, Peter Kaiser, is the electorate chair.

Of course, Carter can stay on as an independent, or resign and force a by-election. Either way, it's a sad day for the Labour caucus, but they'll bounce back.

Chris Carter, I guess, is wishing that Helen Clark was still the leader of the Labour Party. The rest of the caucus are supportive of the current leadership.